SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1b08d2794025a19e9df9fa42d8127bbd5d0803ef56b9e64717281b58b341d8c' 
  AND token = 'Ync39/1LdmOSOIdIUkGHfCz+WLjURc3QFNKBCYo7vJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}